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Duke fans better enjoy Cooper Flagg while they can ... 'cause Seth Curry tells TMZ Sports it won't be long before the Blue Devils baller is starring on NBA courts.
Flagg's currently got Duke rolling into the Sweet 16 of the NCAA tournament ... but on Wednesday, Curry told us he has no doubts the freshman phenom will be lighting it up in the Association soon.
Steph's younger brother -- who played at Duke from 2010-2013 -- said Flagg can score and play defense with the best of them .